Environmental
Ranking
Source Environmentally significant components
1 Tank/piping
sludges, IGF/DGF*
sludge, waxes
Inorganic salts, heavy metals solids, organics,
BOD , sulphides, corrosion inhibitors, biocides,
demulsifiers, wax inhibitors, scale inhibitors,
phenols, PAH, hydrocarbons
2 Production
Chemicals
Demulsifiers, corrosions inhibitors, wax
inhibitors, scale inhibitors, antifoaming agents,
biocides, oxygen scavengers
3 Industrial refuse Heavy metals, metals, plastics, paints
4 Soil movements
owing to e.g.
abandonment and
construction
Hydrocarbons, heavy metals, metals, plastic,
paints, glass
5 Domestic refuse Plastics, glass, organic waste
*IGF, induced gas floatation unit; DGF, dissolved gas floatation unit
Table 3: Ranking of E&P solid waste.